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Fix registration of Windows-specific custom mime types

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Data received by Qt from a native clipboard- or drag'n'drop-source is
mapped to a application/x-qt-windows-mime;value=... mime type, where the
"value" corresponds to the native clipboard format name, e.g.
"FileGroupDescriptor". When we register such a mime type in Qt, then we
need to get the same clipboard format number back. I.e. registering
'application/x-qt-windows-mime;value="FileGroupDescriptor"' needs to
produce the same Windows clipboard format identifier as the call to
RegisterClipboardFormat("FileGroupDescriptor").

Otherwise, a mime converter implementation has to operate on different
clipboard format values in the implementations of the different virtual
functions that are operating on FORMATETC data structures.

Task-number: QTBUG-93632
Change-Id: I0b7e3a2fc0e3f72bffc4490fc0ff4b190e0929a3
Reviewed-by: Timur Pocheptsov <timur.pocheptsov@qt.io>
This commit is contained in:
Volker Hilsheimer 2022-11-01 13:58:11 +01:00
parent c9ad5ad3b7
commit 68f097923f
1 changed files with 9 additions and 3 deletions
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12
src/plugins/platforms/windows/qwindowsmimeregistry.cpp
View File

@ -1496,12 +1496,18 @@ void QWindowsMimeRegistry::registerMime(QWindowsMime *mime)
/*!
Registers the MIME type \a mime, and returns an ID number
identifying the format on Windows.
A mime type \c {application/x-qt-windows-mime;value="WindowsType"} will be
registered as the clipboard format for \c WindowsType.
*/
int QWindowsMimeRegistry::registerMimeType(const QString &mime)
{
const UINT f = RegisterClipboardFormat(reinterpret_cast<const wchar_t *> (mime.utf16()));
if (!f)
qErrnoWarning("QWindowsApplication::registerMimeType: Failed to register clipboard format");
const QString mimeType = isCustomMimeType(mime) ? customMimeType(mime) : mime;
const UINT f = RegisterClipboardFormat(reinterpret_cast<const wchar_t *> (mimeType.utf16()));
if (!f) {
qErrnoWarning("QWindowsMimeRegistry::registerMimeType: Failed to register clipboard format "
"for %s", qPrintable(mime));
}
return int(f);
}